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材料工程  2014 

应变速率循环法构建TC4-DT钛合金本构方程

DOI: 10.11868/j.issn.1001-4381.2014.08.006, PP. 32-35

Keywords: TC4-DT,应变速率循环,本构方程,超塑性变形

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Abstract:

采用应变速率循环法在超塑拉伸机上对TC4-DT钛合金进行三组高温超塑性拉伸实验,变形温度为850~890℃,应变速率为3.3×10-5~3.3×10-3s-1。通过对拉伸实验数据的分析计算出TC4-DT钛合金动态再结晶激活能,并利用Arrhenius模型构建TC4-DT高温条件下的超塑性本构方程。结果表明TC4-DT钛合金的流动应力对变形温度较为敏感,随着温度的升高,流变应力逐渐减小,软化机制愈发明显,870℃附近的超塑性较好,伸长率达到554%。

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